214 ELECTRIC CONDEXSBRS. 



relation of the first of these to each of the others, (c.) Explain 

 electric induction. 



5. (a. ) If a metal globe suspended by a silk cord be brought near 

 the prime conductor of an electric machine in action, feeble sparks 

 will be produced. Explain. (&.) If the globe be held in the hand, 

 stronger sparks will be produced. Explain. 



Recapitulation. In this section we have considered 

 Electric Attraction and Repulsion ; Electricity as 

 a Force ; the existence of Two Kinds of Elec- 

 tricity and their names; the Law of Electric Action ; 

 Tests for the presence and kind of Electricity; Elec- 

 troscopes and their use; Conductors, Insula- 

 tors and Electrics ; the Theory of Electric Fluids ; 

 Electric Induction; Inductive Electrification; 

 that Polarization Precedes Electric attraction ; 

 the Electrophorus ; the Plate and the Dielectric 

 machines and the Operation of each ; the Holtz 

 machine ; Electric Tension. 



ECTION HI. 



ELECTRIC CONDENSERS; LIGHTNING; EXPERI- 

 MENTS. 



351. Condensation of Electricity. By the 



words condensation of electricity we mean the process of 

 increasing the charge which a body may receive from an 

 electrified body having a given tension. If an insulated 

 conductor be brought into contact with the charged prime 

 conductor of an electric machine, the intensity of the 

 charge received cannot exceed that of the prime con- 



